history.cutoff() not properly cutting off user-typed text if an empty deletion is made at the end of the Quill state

[jcayabyab]

Encountered when creating an autocomplete system for Quill. The key here is this line: editor.deleteText(editor.getLength() - 1, 0), which deletes nothing at the end of the state. If this line is commented out, the cutoff() line works as expected.

Steps for Reproduction

1. Visit minimal JSFiddle: https://jsfiddle.net/gpvtdxrc/3/
2. Type some text, e.g., "test" , then press "Insert"
3. Press undo
4. Notice that the typed text also gets deleted

Video reproduction:

Edit.fiddle.-.JSFiddle.-.Code.Playground.-.8.May.2024.mp4

Expected behavior: The typed text is preserved

Actual behavior: The typed text is deleted

Platforms: MacOS Sonoma 14.4.1, Chrome 123.0.6312.124 (arm64)

Version: 2.0.1